Arduino Uno R4 WiFi with DHT22 Sensor

This project is a test of using the Arduino Uno R4 WiFi to serve DHT22 sensor data over a simple website based on some modern web tools like TypeScript and Parcel.js.

https://github.com/haukex/unor4wifi_dht22

The firmware will read out the DHT22 and report its values on the Arduino's LED matrix as well as the USB serial port (note a WiFi configuration is required). WiFi can be configured either as an Access Point or a client by sending the command RECONF over the USB serial port to the Arduino; configuration is stored in EEPROM.

Development Environment

I developed this on Windows (Git Bash and VSCode), but I think it should work with other IDEs, command line only, and on Linux as well.

Arduino

• Download the latest Arduino CLI (64 bit Windows exe) from https://arduino.github.io/arduino-cli/latest/installation/#download
  • Unpack and place arduino-cli.exe into a dir in PATH, e.g. ~/bin
  • If needed: arduino-cli config init and edit the generated config file to include the line locale: en_US
  • arduino-cli core update-index
  • arduino-cli core install arduino:renesas_uno

Web Page

The following in the webpage subdir:

• Setting up dev env:
  • Set up Node and Typescript as per https://github.com/haukex/toolshed/blob/eef5bb57/notes/JavaScript.md#nodejs-and-typescript (or later versions as appropriate)
  • npm install (uses package.json)
• Can run dev server via npm start

Building

Just run ./build.sh, or look into that file for the individual build steps. To just run the serial port monitor, use ./ardu.py monitor.

Author, Copyright, and License

This work © 2023 by Hauke Dämpfling (haukex@zero-g.net) is licensed under Attribution-ShareAlike 4.0 International. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/